Abstract
The changes in air density linked with geomagnetic disturbance, as predicted by various thermospheric models at heights near 800 km are compared by analysis of laser range data acquired during the operational lifespan of SEASAT. Computations incorporate the satellite-drag-based model J71, its variants proposed by Slowey (1983, Adv. Space Res. 3, 67; 1984, NASA Conf. Report 3835) derived from ESRO 4 mass spectrometer data, and the 1983 MSIS model. Comparisons establish a preference for the simpler J71 model for geomagnetic activity, being superior to the ESRO 4 model and comparable with MSIS83 in most studies. The introduction of persistence of a geomagnetic event by a weighted average of the preceding geomagnetic activity leads to improvements in J71 for large well-defined storms.
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